From The Quotable Mises — surrounding passage

It works and produces effects even if party programs and textbooks refuse to acknowledge it as truth. Planning for Freedom , p. 11 Truth is not the halfway point between two untruths. On the Manipulation of Money and Credit , p. 88

“Yet the criterion of truth is that it works even if nobody is prepared to acknowledge it.”

The Ultimate Foundation of Economic Science , p. 94 At least one of the characteristic marks of a true theory is that action based on it succeeds in attaining the expected result. In this sense, truth works while untruth does not work. Theory and History , p. 123 Truth persists and works, even if nobody is left to utter it. Austrian Economics: An Anthology , p.